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You must have a decompressor installed on your computer before some media files can play. If a required decompressor is not available on your computer, Windows Media Player attempts to download and install it.
This error indicates that the decompressor did not download because your Internet security option is set on High. Although a High setting for Internet security is the safest way to browse, it is also the least functional. This level of security blocks the decompressor from downloading.
To lower your Internet security level to Medium, follow these steps: